660 in words
660
six hundred sixty
660 is written six hundred sixty.
Ways to write it
- As an ordinal
- six hundred sixtieth
- Roman numeral
- DCLX
- Expanded form
- 600 + 60
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 6 | 600 |
| tens | 6 | 60 |
| ones | 0 | 0 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 3, 4, 5, 6, 10, 11, 12, 15, 20, 22, 30, 33, 44, 55, 60, 66, 110, 132, 165, 220, 330 and 660 (24 factors)
- First 10 multiples
- 660, 1,320, 1,980, 2,640, 3,300, 3,960, 4,620, 5,280, 5,940, 6,600
- Square
- 660 × 660 = 435,600
- Square root
- ≈ 25.69
- Sum of the digits
- 6 + 6 + 0 = 12
- Rounded to the nearest 10
- 660
- Rounded to the nearest 100
- 700
- Number before
- 659
- Number after
- 661
- In binary
1010010100
Quick check
What number comes just after 660?
Show the answer
661
Is 660 even or odd?
Show the answer
Even
What is 660 + 10?
Show the answer
670
Practise with a game
Factors, Multiples & Primes
Multiples, factors, prime numbers, square numbers and prime factors.
Roman Numerals
Read and write Roman numerals from I to 3,999.Frequently asked questions
How do you write 660 in words?
660 is written "six hundred sixty".
Is 660 a prime number?
No. 660 is a composite number, because it has more than two factors.
What are the factors of 660?
The factors of 660 are 1, 2, 3, 4, 5, 6, 10, 11, 12, 15, 20, 22, 30, 33, 44, 55, 60, 66, 110, 132, 165, 220, 330 and 660.
How do you write 660 in Roman numerals?
660 in Roman numerals is DCLX.